Mar 28, 2026
LocalStack archived its GitHub repo in March 2026 and now requires an auth token for every image pull. The free Community Edition is gone. If your CI depends on docker pull localstack/localstack without credentials, it's already broken.
After evaluating the alternatives, @MiniStack — Free Local AWS Emulator stood out for one reason: it runs real infrastructure, not mocks.
MiniStack vs @LocalStack
LocalStack moved to BSL licensing and mandatory accounts. The Community Edition is frozen — no security patches, no updates. CI credits are gated by pricing tier.
MiniStack. The best alternative to LocalStack. — Free Local AWS Emulator is MIT licensed. No account, no API key, no telemetry. Same port (4566), same endpoint format. Drop-in swap:
docker run -p 4566:4566 nahuelnucera/ministack
Image is ~150 MB vs LocalStack's ~1 GB. Idles at ~30 MB RAM vs ~500 MB.
The Real Infrastructure Difference
Most AWS emulators fake everything in memory. MiniStack doesn't — not where it matters.
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RDS creates actual Postgres/MySQL Docker containers. Not a mock. A real database you can connect to with psql.
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ElastiCache spins up real Redis containers with IAM auth support.
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ECS runs real Docker containers.
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Athena executes real SQL via DuckDB.
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Lambda runs real Python with warm starts between invocations.
No other free emulator does this. @LocalStack had real databases only in Pro. @Floci and @Moto fake it in memory.
vs @Floci
@Floci is fast and lightweight (~90 MB image, ~13 MB idle RAM, 24ms startup). Solid for quick CI emulation. But everything is in-memory. If integration tests need actual database connections, actual Redis commands, actual container execution — MiniStack is the better fit.
vs @Moto
@Moto is the gold standard for Python unit tests — in-process, no Docker, fast. Right tool for mocking boto3 calls. But it doesn't run a service or provide real endpoints. If tests need actual network calls or work across languages beyond Python, MiniStack fills that gap.
21 Services, One Port
S3, SQS, SNS, DynamoDB, Lambda, RDS, ElastiCache, ECS, Athena, IAM, STS, Secrets Manager, SSM Parameter Store, EventBridge, Kinesis, CloudWatch Logs, CloudWatch Metrics, SES, Step Functions, Glue.
Works with boto3, @AWS CLI, @Terraform, @AWS CDK, @Pulumi — any tool that speaks the AWS API.
Bottom Line
If you need a free, MIT-licensed, drop-in LocalStack replacement that spins up real databases and real containers instead of faking it — MiniStack is it.
GitHub: https://github.com/Nahuel990/ministack
Docker Hub: nahuelnucera/ministack
Website: https://ministack.org
